JP2551266B2 - How to replace the coke oven kiln protection plate - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for replacing a protective plate for holding a kiln brick placed behind a back stay of a coke oven.

[0002]

2. Description of the Related Art Most coke ovens are constructed of silica bricks and clay bricks, and partially heat insulating bricks and red bricks are used. For this reason, in the coke oven, back stays are vertically arranged at predetermined intervals along the furnace end retaining walls at both ends in the furnace group direction for protection of the furnace body, and cross tie rods are passed through two opposite upper and lower back stays. Back stays are arranged vertically at predetermined intervals along the furnace end wall in the furnace length direction, cross tie rods are passed through the upper and lower two places of the opposing back stays, and tightened with a predetermined load from both ends using a tightening mechanism such as a spring. The furnace bricks are tightened through the stays.

However, in the coke oven, the charging of the coal at the room temperature and the kiln firing of the red hot coke exceeding 1000 ° C. are repeated for many years until it deteriorates when the operation is started and is stopped. The total weight is 150
~ 300 tons of coal car travels back and forth tens to hundreds of times a day. Therefore, the coke oven will eventually reach the end of its life due to damage and loosening of the furnace body due to mechanical and thermal stresses that act in accordance with the carbonization cycle.

Since the cost of one renewal of the coke oven at present is very large, it is necessary to extend the life of the existing coke oven for the time being from the viewpoint of waiting for a medium-term judgment such as a study on a new inexpensive coke production method. It has become an important issue. Therefore, at present, it is important to measure which part of the furnace body of the coke oven is damaged and to what extent to evaluate the degree of deterioration, and to repair the coke oven at an appropriate timing.

As described above, in the coke oven, after the lapse of 20 years or more after the operation, the aging of the furnace main body and the furnace fasteners progresses. For this reason, in order to further prolong the life of the coke oven, it is necessary to replace the kiln protection plate in which the cracking of the kiln mouth protection plate and the protrusion of the kiln are progressing.
However, there is no case of replacing the protective plate in Japan, and the construction method has not been established.

Conventionally, the damage condition of the kiln mouth protection plate of the coke oven is arranged behind the back stay 22 of the coke oven 21 and the kiln mouth frame 24 of the carbonization chamber 23 is shown as an example in FIGS. 3 and 4. The protective plate 25 to be held may be cracked in the horizontal direction to be divided, and may protrude toward the carbonization chamber side. When the protective plate 25 is damaged as described above, the gas generated in the kiln leaks from the crack portion and the gas leaks from the surface of the protective plate. In addition, damage to the protective plate 25 cannot sufficiently transfer the furnace fastening force of the back stay to the kiln-mouth brick, and loosening occurs in the furnace wall brick due to improper furnace fastening, resulting in incomplete gas leakage into the combustion chamber. Black smoke is emitted from the chimney due to combustion. Further, the protrusion of the protective plate 25 to the kiln opening causes not enough attachment / detachment of the furnace lid, which not only causes the kiln to be delayed, but also
There is a risk of damage to the furnace lid removal device. Furthermore, the resistance at the time of coke extrusion is increased, which also causes clogging.

[0007]

When the above-mentioned kiln mouth protection plate is damaged, the current countermeasure is to prevent the prolongation of the protection plate to the kiln mouth from delaying the kiln, which hinders the production in operation. As a first-aid measure, only the part that comes out of the agar is melted and dealt with.

An object of the present invention is to provide a protection plate replacement method capable of safely performing hot replacement of a kiln mouth protection plate of a coke oven in an actual furnace without causing collapse of the kiln mouth brick or the protection plate. To do.

[0009]

Means for Solving the Problems The inventors of the present invention have made extensive studies to achieve the above object. As a result, the protective plate separated by the cracks can be pulled out if it is fixed to the one piece by the connecting metal fittings, and the kiln brick can be adjusted by the jig supported by the adjacent back stay. If you attach a presser support hardware, you can press,
The present invention has been reached by the conclusion that the protective plate can be replaced without causing looseness in the furnace brick by pressing the kiln brick against the holding support metal and then cutting and removing the back stay, and reached the present invention.

That is, the present invention relates to a method for replacing a protective plate for holding bricks at a coke oven kiln opening, in which a protective plate divided by a crack is fixed to a unitary body by a connecting metal fitting and supported by an adjacent backstay. After pressing the kiln mouth brick through the tool and the brick retainer support metal, cutting and removing the back stay and removing the protective plate, then loading and installing a new protective plate, then loading and welding the back stay to connect and restore To do.

[0011]

According to the present invention, since the protective plate divided by the occurrence of cracks in the coke oven kiln is fixed to the integrated body by the connecting metal fitting, the divided protective plate does not drop even if the back stay is cut and removed. Also, prior to cutting and removing the back stay, the jig supported by the adjacent back stay presses the kiln mouth brick through the brick pressing support metal, so even if the furnace stay clamping force is released by the back stay, the furnace body The brick will not loosen. Furthermore, after cutting and removing the back stay, the protective plate is removed, and a new protective plate is carried in and attached, so that the protective plate can be replaced without damaging the kiln brick. Furthermore, after the protective plate is loaded and mounted, the back stay is loaded and connected by welding to restore, so that it can be smoothly removed and restored.

As a work to be carried out prior to the replacement of the protective plate, the mortar is sprayed on the brick at the mouth of the kiln to prevent the brick from collapsing, and at the same time, a heat insulating plate is attached to the charring chamber kiln on both sides of the protective plate to be replaced. Then, the radiant heat from the carbonization chamber is shut off. Then, the kiln frame of the carbonization chambers on both sides is removed.

The fixing of the protective plate divided by cracks to the integral body is because the protective plate is provided with bolt holes for attaching the kiln frame at predetermined intervals along both sides, so that the kiln frame is attached. Using the bolt holes, connect the fittings such as angles with bolts and fix them integrally.
In addition, prior to cutting and removing the backstay, the brick pressing support metal held by the jig supported by the adjacent backstay presses the brick on the back of the protective plate, and the brick pressing support metal is welded and fixed to the tip of the T-shaped support metal. The brick retainer is brought into contact with the corner portion of the kiln brick in the height direction of the carbonization chamber, and the pushing force of the brick retainer is adjusted and held by the jig.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to FIGS. FIG. 1 is a layout explanatory view of an apparatus used for replacing a protection plate of the present invention, and FIG. 2 is a perspective view of a case where the divided protection plate of the present invention is fixed as an integrated body. In FIG. 1, 1 is a carbonization chamber of a coke oven, and the kiln mouth bricks 2 of each carbonization chamber 1 are fastened by a back stay 4 via a protective plate 3. The kiln opening frame 5 of the carbonization chamber 1 is fixed to the protective plate 3 by bolts, and has a structure in which a knife edge of a furnace lid (not shown) contacts and seals. When the protection plate 3 is replaced, mortar is sprayed on the kiln mouth bricks 2 and 2 of the both sides carbonization chambers 1 and 1 of the protection plate 3 to be replaced to prevent the bricks from collapsing, and then the carbonization chambers 1 and 1 on both sides are replaced. Although not shown, a heat insulating material is attached to the kiln opening to prevent radiant heat from the carbonization chambers 1 and 1, and then the kiln frame 5 and 5 of the carbonization chambers 1 and 1 on both sides are removed to complete the preliminary work.

Next, the adjacent back stays 4 and 4 on both sides
A plurality of jigs 6 are attached in the vertical direction of the carbonization chamber 1, and a T-shaped brick presser metal 7 of a brick presser support metal 8 having a T-shaped brick presser metal 7 welded and fixed to the tip thereof is attached to the corner of the kiln brick 2. The brick pressing support metal 8 is adjusted by pressing the nut 9 of the brick pressing support metal 8 penetrating the jig 6 to adjust the pressing force of the brick pressing support metal 8 to hold the kiln mouth brick 2 under pressure. Then, as shown in FIG. 2, the protective plate 3 divided by the cracks is connected and integrated with the connecting fitting 10 such as an angle by the bolts 11 using the mounting bolt holes of the kiln frame 5. The upper and lower bolts 11 penetrate the jig 6 and the nut 12 holds the protective plate 3 so that it can be detached from the kiln brick 2.

After that, the back stay 4 is disconnected from the upper cross tie rod (not shown), cut in the vicinity of the middle deck, and taken out by a wrecker or the like. Then, by tightening the nut 12 of the protective plate pull-out bolt 11, the kiln mouth brick 2 is detached while being pushed by the brick retainer support metal 8 and is taken out and carried out. Then, after carrying in a new protective plate 3 in the reverse manner and setting it in the kiln mouth brick 2 part, the back stay 4 is carried in and connected by welding, and a cross tie rod (not shown) is connected to the upper part of the back stay to connect the furnace body. Apply tightening force to restore. After that, the protective plate pull-out bolts 11 and 11 and the brick pressing support metal parts 8 and 8 are removed, and the kiln frame 5 and 5 are attached to the carbonization chambers 1 and 1 on both sides,
The heat insulating material attached to the kiln is removed, and the replacement of the protective plate 3 is completed.

When hot replacement was carried out in an actual furnace having a furnace height of 5000 mm by the protective plate replacement method of Example 1, the kiln-mouth bricks could be restored smoothly without collapse. After the restoration, the operation is running smoothly and no problems have occurred.

[0018]

As described above, according to the method of the present invention, it is possible to replace a damaged protective plate in the coke oven kiln opening, which greatly contributes to extending the life of the coke oven.

[Brief description of drawings]

FIG. 1 is a layout explanatory view of an apparatus used for replacing a protective plate according to the present invention.

FIG. 2 is a perspective view of a case where the divided protection plate of the present invention is fixed as an integrated body.

FIG. 3 is a cross-sectional view showing the protrusion of a protective plate into the kiln opening.

FIG. 4 is an explanatory diagram of a damage state of a conventional protection plate.

[Explanation of symbols]

 1,23 Carbonization chamber 2 Kiln bricks 3,25 Protective plate 4,22 Backstay 5,24 Kiln frame 6 Jig 7 Brick retainer 8 Brick retainer support 9, 12 Nut 10 Connecting fitting 11 Protective plate pull-out bolt 21 Coke oven

Claims (1)

(57) [Claims] 1. A method of replacing a protection plate for holding bricks in a coke oven kiln opening, wherein the protection plate divided by cracks is fixed to a unitary body by a connecting fitting, and the jig and the brick supported by an adjacent backstay. After pressing the kiln brick through the presser support hardware, remove the back stay and remove the protective plate, then carry in the new protective plate and attach it, then carry in and weld the back stay to connect and restore. A characteristic method of replacing the coke oven furnace protection plate.